Electrically lighted sewing machine



1936. H. J. GOOS'MAN 2,031,562

ELECTRICALLY LIGHTED SEWING MACHINE Filed July 13, 1933 2 Sheets-Sheet l Feb 18 $336. H. J, N 2,031,562

ELECTRICALLY LIGHTED SEWING MACHINE Filed July 15, 1933 2 Sheets-Sheet 2 Patented Feb. 18, 1936 UNITED STATES ELECTRIGALLY LIGHTED SEWING MACHINE Herbert J. Goosman, Elizabeth, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application July 13, 1933, Serial No. 680,219

10 Claims.

Electric sewing machine lighting devices as heretofore constructed and applied to the sewing machine, when of ample illuminating capacity, have been objected toin some cases because of their inordinate size relative to the sewing machine frame and in general because of the high temperature to which the lamp-shade is raised by the heat from the lamp; such high temperature making the lamp-shade a radiator of a discomforting amount of heat into the operators face and further making it necessary for the operator to use great care not to touch the hot lamp-shade.

It has heretofore been proposed to overcome the objection of discomforting heat radiation by placing the lighting device horizontally directly in rear of the overhanging member of the sewing machine gooseneck, which member functioned as a barrier to radiant heat between the lighting device and the operators face. In cases where, for any reason, it is desired to position the lighting device in front of the gooseneck, the desirable heat-barrier function of the gooseneck is lost.

25 It has also been proposed to prevent overheating of the lamp-shade by interposing between it and the lamp-bulb a thin sheet-metal liner separated from the shade by an air-gap through which cooling currents of air may freely flow by 30 convection.

The present invention has for an object to pro vide simple, sturdy, inexpensive, unobtrusive, easily constructed, and readily assembled means for the electric illumination of a sewing machine, which will adequately illuminate the work being stitched without danger or discomfort to the operator, and which does not depend upon an additional liner or upon the heat barrier function of the sewing machine gooseneck to shield the op- 4 erator from discomforting heat radiation from the lighting device.

Another object of the invention is to provide an electrically lighted sewing machine, the lighting device of which, while of relatively small 45 physical size and relatively high wattage, is so contrived and combined with the sewing machine as to afford generous illumination of the work without discomforting radiation of heat.

A further object of the invention is to pro- 50 vide a sewing machine with a built-in lighting device which is simple in construction, inexpensive to manufacture, easy to assemble and apply to the sewing machine, and which does not interiere in any manner with the normal operation 5 and use of the sewing machine or with the assembling or disassembling of the parts of the machine.

With the above and other objects in View, as will hereinafter appear, the invention comprises ,95. the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawings Fig. 1 ma front side elevation of a sewing machine embodying the invention. Fig. 2 is a section on the line 22, Fig. 1. Fig. 3 is a fragmentary top plan view of the machine. Fig. 4 is a vertical longitudinal section through the electric lighting device of the machine. Fig. 4a. is a detail view of a portion of the lamp filament used in this device. Fig. 5 is a section on the line 5-5, Fig. 1. Fig. 6 is a fragmentary perspective view of the sewing machine gooseneck from which the lighting device has been removed and Fig. 7 is a perspective view of the lighting device removed from the machine.

For the purposes of the present disclosure the invention is described as embodied in a preferred form in a sewing machine having a hollow bed I from which rises the standard 2 of the hollow" inverted L-shaped gooseneck 3 terminating in the head 4 carrying the usual reciprocatory needle-bar 5, needle 6, presser-bar I, presser-foot 8, take-up 9 and tension device l0. Disposed within and lengthwise of the overhanging member 3 of the gooseneck is the sewing machine main shaft s which is connected in the usual manner to drive the needle-bar 5, take-up 9 and the usual loop-taking and feeding devices (not shown) customarily located below or within the bed I. The overhanging member 3 of the goose-' neck is preferably of curved contour and is tapered inwardly, Fig. 3, from the standard 2, or gradually reduced in section, to a point a: intermediate the standard 2 and head 4, from which intermediate point a: the gooseneck is tapered outwardly or enlarged in section toward the head 40 4. The gooseneck is preferably formed in its curved and tapered front side wall, Fig. 6, with a flat vertical seat ll which may be sunk somewhat below the normal curved and tapering surface of the gooseneck and made parallel to the main shaft s. The gooseneck 3 may be formed in its side wall at one end of the seat H with a slot l2 and is preferably formed adjacent the other end of the seat H with a step or auxiliary seat I l in which there is an aperture I3 opening into the hollow interior of the gooseneck 3.

The electric lightng device preferably comprises an electric lamp-socket shell M of hollow tubular form closed at one end I5 and open at its other end It. Projecting rearwardly from the socket-shell I4 is a lug ll formed with alateral slot I8. The socket-shell 14 has a slot IS in its lower wall opening into the lateral slot It! in the lug l1.

Preferably, 'cast integral with the lamp-socket shell I4 is the inverted trough-shaped lamp-shade having-preferably a flat vertical rear wall 20, a frontyvall 2| and an arched top connecting wall wall 22. The rear wall 20 of the shade preferably extends below the lever of the free edge of washer 21 is the lamp-socket 28 having the usual spring-pin lamp-base-engaging contacts 29 to which are connected the conductor wires 30 of the lead-sheathed conductor cable 3| passing downwardly through the slotted conductor lead-in lug l1 and through the aperture l3 into the hollow gooseneck.

By virtue of the provision of the slots l8 and IS in the socket-shell l4 and conductor lead-in lug II, the lamp-socket 28 may first be wired and assembled with the cable 3| and the wired socket assembly slid into the socket-shell M; the cable 3| passing along the slot I9 and into the slot I8 in which it is secured by the clamp-screw 32. One conductor of the cable 3| may be connected at its lower end through a conventional toggle-switch 33*t0 a contact element 34 of the usual terminal block 35. The other conductor 30 may be connected directly to another contact element (not shown) of the block 35.

In accordance with the principles of the present invention it is important that the lamp-shade be made tofunction as an extremely good or rapid conductor of heat and, to this end, the shell l4 and walls 20, 2|, 22 of the lamp-shade are preferably die cast in metal of high heat-conductivity, such as one of the well known aluminum alloys of high aluminum content. Such an alloy may contain, say, from 6 to 8 percent of copper and from 2 to 3 percent of silicon with the balance of commercially pure aluminum. The walls of the cast aluminum shade are relatively thick, as compared with rolled sheet metal such as is customarily used for making lampshades, and insure mechanical strength as well as large heat-conductive capacity and a rapid heat flow into the gooseneck from the shade 2|, 22, 2|] and shell M, the preferably ofiset flat rear walls of which shade and shell are in intimate thermal contact over a relatively large vertical surface area with the stepped seats I I, H The corner 22 of the shade is preferably received in the slot l2 in the gooseneck and is protected by the gooseneck. The socket-shell l4 and shade wall 20 are also preferably in juxtaposition with the top and bottom ledges II and II of the stepped seats II, I l It will be observed, particularly in Figs. 1 and 4, that the area of thermal contact between the sewing machine arm 3 and the lamp-shade and socket-shell unit detachably seated thereon, is approximately equal to the axial sectional area of the lamp-bulb 36. This extensive area of thermal contact permits of a very rapid flow of heat from the lamp-shade into the sewing machine arm in accordance with the principle of the invention.

According to the present invention, the gooseneck of the machine is made to function as a primary reservoir and radiator of heat from the lighting device and, to this end, should have a large surface area relative to the surface area ofithe lampi-sh'adeand'.socket-shell elements. It

should also be so constructed that it will function to rapidly conduct the heat stream away from its areaof contact With lamp-shade and socket-shell elements and spread the heat well over its relatively large surface, from which the heat is readily dissipated to the surrounding air without an objectionable rise in temperature in any of the parts of the lamp-shade, lamp-socket shell or gooseneck. While it is preferred to cast the gooseneck also of aluminum alloy, it may be made of cast-iron or other metal of lower heat-conductivity than aluminum, provided its metallic cross-sectional area is sufiicient to insure large heat-conductive capacity and a surficiently rapid spread of heat to and over a relatively large proportion 'of its surface to prevent an excessive or objectionable localized temperature rise in the lamp-shade or adjacent the position of attachment of the lamp-shade and socket-shell casting. Because of the high degree of accuracy with which aluminum die-castings can be made, the gooseneck 3 and shell and shade castings may, when cast in aluminum, be secured together in intimate thermal contact over a relatively large contact area as compared'with the total area of the lamp-shade, without subsequent machining operations, to insure a very free and rapid flow of heat from the lamp-shade and socket-shell into the relatively large gooseneck 3.

In the preferred embodiment of the invention illustrated the vertical height of the stepped seats ll, ll is at least equal to the diameter of the lamp-bulb 36. Excellent heat-conductive contact with low impedance to the heat stream is thus afforded between the lamp-shade and the supporting gooseneck to insure against objectionable overheating of the lamp-shade. The lamp-bulb 36 is preferably of the conventional, horizontally disposed, commercial, sewing machine lighting type, of tubular form, approximately inch in diameter and 2 inches long, exclusive of its base 36', and has the usual concentrated filament 36 which is in the form of a fine helix, as shown in Fig. 4 and is draped back and forth as usual upon the hangers 36 within a cylindrical space inch in diameter by inch long. Such a lamp may be connected directly to a commercial 120 volt lighting circuit and is rated at 15 Watts.

I believe that I am the first to provide a sewing machine with ashaded electric lighting device having an illuminating capacity which is adequate for practical use, without objectionable operative or accompanying heat characteristics, and I accomplish this new result by utilizing the gooseneck of a sewing machine as the primary radiator or dissipator of heat from the shade of the lighting device and by providing for a rapid conduction of heat through the lamp-shade and from the lamp-shade into the gooseneck.

I am aware that it has been proposed to mount an electric lighting device including a lamp and reflector either partially or wholly within a recess in the under side of the overhanging gooseneck of a sewing machine, but in such outfits the lamp-bulb and reflector either encroach objectionably upon the space under the gooseneck or must be made small enough to avoid interference with the working parts of the machine within the gooseneck and, when so made, either do not give suiiicient illumination to be of practical use or have objectionable heating charec t1cs. i Y I The invention is not to be understood as limited to the specific embodiment thereof shown and described, as it is obviously susceptible of embodiment in various specifically different .forms within the spirit and scope of the invention.

Having thus set forth the nature of the invention, what I claim herein is:-

1. The combination with a sewing machine formed with a frame including a bed and a hollow gooseneck of good heat conductivity and relatively large surface area, with stitch-forming mechanism incorporated in said frame, of a lighting device including an electric lamp-bulb of relatively high wattage and small physical size together with a lamp-socket and a correspondingly small one-piece highly heat-conductive inverted trough-shaped lamp-shade and tubular lampsocket shell carrying said lamp and lamp-socket and detachably mounted on the front side of said gooseneck with a large portion of the surface of the lamp-shade and lamp socket shell in direct heat-conductive contact with said gooseneck, whereby a rapid flow of heat is had through and from the shade and shell elements into the gooseneck which functions as a primary heat radiator from the extensive surface area of which the heat is dissipated with only a moderate rise in downwardly within said hollow temperature.

2. An electrically lighted sewing machine having a frame comprising a bed and overhanging hollow gooseneck, said gooseneck being formed at one side thereof with a seat and with an aperture adjacent to said seat, a one-piece metallic electric lamp-socket shell and lamp-shade member having a portion mating with and secured to said seat and a portion received in said aperture, an electric lamp-socket mounted in said shell, and an electric conductor cable housed within said hollow gooseneck and passing outwardly through said aperture to said lamp-socket.

3. An electrically lighted sewing machine having a frame comprising a bed and gooseneck, said gooseneck having a vertical standard and a horizontal arm overhanging said bed, said arm being formed at one side thereof with a flat vertical seat, an electric lamp-socket shell and lampshade member, said member having a hollow tubular socket-shell portion closed at one end and open at its other end, said member further having an inverted trough-shaped lamp-shade portion cast in one piece with and projecting beyond the open end of said shell-portion, said lamp-shade portion having a vertical inner wall extending downwardly belowthe level of its outer free edge and screwed to said seat, and an electric lamp-socket mounted in said socket-shell portion.

4. An electrically lighted sewing machine having a frame including a bed and an overhanging hollow gooseneck formed with an aperture in a side wall thereof, a one-piece hollow tubular socket-shell closed at one end and open at its other end and having a laterally slotted lug projecting rearwardly therefrom and entering the aperture in said gooseneck, said socket-shell having a slot in its lower wall extending from the open end thereof to and opening into the lateral slot in said lug, an electric lamp-socket mounted in said shell, an electric conductorcable extending from said lamp-socket through said lug and gooseneck, and

means for securing said socket-shell to said gooseneck.

5. The combination with a hollow tubular sewing machine gooseneck of inverted L-shape with a seat at one side thereof and with an aperture adjacent to said seat, of a one-piece electric lampsocket shell and lamp-shade member die-cast in aluminum, the lamp-socket shell portion of said member being formed with a conductor lead-in lug received in said aperture and the lamp-shade portion of said member being formed with a side wall portion secured fiatwise to said seat, an electric lamp-socket mounted in said shell portion, and an electric conductor cable leading upwardly within said hollow gooseneck and through said lug tosaid lamp-socket.

6. The combination with a hollow sewing machine gooseneck of die-cast aluminum, said gooseneck being of inverted L-shape the overhanging horizontal portion of which is formed at one side thereof with a seat, of an electric lamp-shade of inverted trough shape die-cast of aluminum with front and back side walls and a connecting top wall, means for securing one of, the side walls of said shade fiatwise against said seat, an electric lamp-socket shell cast integrally with said shade, and an electric lamp-socket mounted in said shell.

7. The combination with a sewing machine having a frame including a bed and a gooseneck formed with a hollow standard rising from said bed and with an overhanging hollow arm terminating at its free end in a head, said arm being of curved contour and tapered inwardly and reduced in cross-section between said standard and head and formed at one side thereof with a stepped seat, of an electric lighting device including a lamp-socket shell and lamp-shade member cast in one piece in aluminum, with a stepped rear wall secured to said seat, and an electric lamp-socket and lamp mounted in said socket-shell and shade member.

8. An electrically lighted sewing machine having a frame including a bed and an overhanging tapered gooseneck formed with stepped seats, and an electric lighting device having metallic lamp-socket-shell and lamp-shade elements in engagement, respectively, with said seats.

9. An electrically lighted sewing machine having a frame including a bed and an overhanging tapered gooseneck formed at one side with stepped parallel seats, a one-piece detachable electric lamp-socket-shell and lamp-shade member having offset parallel walls in engagement, respectively, with said seats, an electric lamp-socket mounted in the socket-shell portion of said member, and an electric lamp-bulb carried by said lamp-socket.

10. The combination with a sewing machine having a bed and a gooseneck with a relatively large heat-radiating surface, of an electric lighting device including a tubular electric lamp of at least watts power consumption disposed entirely at one side of the central vertical plane of the gooseneck and having a one-piece inverted trough-shaped metallic lamp-shade and tubular lamp-socket shell of relatively high heat conductivity detachably seated in thermal contact with said gooseneck over a surface area approximately equal to the axial sectional area of said lamp-bulb.

HERBERT J. GOOSMAN. 

